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Texas Instruments OPA4347UA
- Part No.:
- OPA4347UA
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA4347UA.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:24,205
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Product details
Overview
OPA4347UA from Texas Instruments is a quad, rail-to-rail input/output, microPower operational amplifier in SO-14 package, delivering 350kHz bandwidth, 20µA per-channel quiescent current, and operation from 2.3V to 5.5V single supply - optimized for battery-powered smoke and CO detectors.
For engineers reviewing the OPA4347UA datasheet, OPA4347UA pinout, OPA4347UA application, or OPA4347UA equivalent, key selection criteria include ultra-low IQ, rail-to-rail swing at sub-3V operation, guaranteed –55°C to +125°C performance, and SO-14 compatibility with space-constrained portable sensor front-ends.
Technical Context
The OPA4347UA employs complementary differential input pairs enabling rail-to-rail common-mode range (V– – 0.2V to V+ + 0.2V) and class AB output stage supporting 5mV rail swing into 100kΩ loads. Its unity-gain stable architecture drives ADC inputs with minimal settling time (21µs to 0.1%).
Each of the four amplifiers operates independently with matched specifications: input bias current ≤ ±10pA, open-loop gain ≥ 100dB at 5.5V, and PSRR ≥ 128dB at 1kHz - ensuring low crosstalk and high CMRR in multi-channel sensing configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.3V to 5.5V single supply - enables direct interface with Li-ion, coin-cell, or 3.3V/5V system rails without level-shifting. |
| Quiescent Current (per channel) | 20µA typical - supports >1-year battery life in always-on smoke detector applications using CR2032 cells. |
| Gain-Bandwidth Product | 350kHz - sufficient for conditioning slow-varying gas sensor outputs (e.g., electrochemical CO transducers) with <1% error. |
| Input Offset Voltage | 2mV max at 25°C - ensures <50µV offset-induced error in 25mV full-scale sensor signal paths. |
| Output Voltage Swing | Within 5mV of rails (RL = 100kΩ) - preserves dynamic range in low-voltage 2.5V–3.3V data acquisition systems. |
| Operating Temperature Range | –55°C to +125°C - qualified for automotive cabin sensors and industrial fire alarm control panels. |
Pinout & Package
OPA4347UA is housed in a 14-pin SOIC (SO-14) surface-mount package with standard JEDEC MS-012AC footprint and 1.27mm pitch.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Out A | Amplifier A output - drives first-stage signal conditioning or ADC buffer path. |
| 2 | –In A | Inverting input for Amplifier A - accepts feedback or differential reference signals. |
| 3 | +In A | Non-inverting input for Amplifier A - connects to sensor output or bias network. |
| 4 | V– | Negative supply rail - tied to ground in single-supply configurations. |
| 5 | +In B | Non-inverting input for Amplifier B - used for dual-sensor monitoring or reference buffering. |
| 6 | –In B | Inverting input for Amplifier B - supports differential measurement of paired gas sensors. |
| 7 | Out B | Amplifier B output - provides second independent analog channel. |
| 8 | V+ | Positive supply rail - accepts 2.3V–5.5V DC input; requires 0.01µF ceramic bypass. |
| 9 | Out C | Amplifier C output - enables three-channel sensor fusion (e.g., CO + smoke + temperature). |
| 10 | –In C | Inverting input for Amplifier C - configurable for active filtering or gain-setting. |
| 11 | +In C | Non-inverting input for Amplifier C - interfaces with thermistor or humidity sensor output. |
| 12 | +In D | Non-inverting input for Amplifier D - supports calibration reference or watchdog comparator input. |
| 13 | –In D | Inverting input for Amplifier D - used for precision zero-crossing detection or fault monitoring. |
| 14 | Out D | Amplifier D output - delivers fourth analog channel for system diagnostics or redundancy. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input range | Extends 200mV beyond supply rails - allows direct interfacing with sensors whose output exceeds V– or V+ (e.g., piezoresistive elements). |
| Ultra-low quiescent current | 20µA per amplifier - reduces total system standby power to <100µA for quad-channel operation, critical for UL-certified battery-only alarms. |
| Unity-gain stability | Guaranteed stable with no external compensation - simplifies PCB layout in compact smoke detector modules where board area is constrained. |
| High CMRR at low voltage | 70dB minimum at 2.5V supply - rejects common-mode noise from shared power rails in multi-sensor PCBs. |
| Specified over extended temperature | –55°C to +125°C operation - meets AEC-Q200 stress requirements for under-hood or HVAC-integrated safety systems. |
Applications
| Smoke Detection Front-End | CO Gas Sensor Signal Chain |
|---|---|
|
Use Scenario: Amplifying weak current output from ionization or photoelectric smoke chambers into clean voltage signals for MCU ADC sampling. IC Role / Device Role / Timing Role: Quad OPA4347UA configures as transimpedance amplifier (Ch A), filter (Ch B), reference buffer (Ch C), and comparator input driver (Ch D). Use Value: 20µA/channel IQ enables >2-year battery life in UL 217-compliant standalone alarms; rail-to-rail swing preserves SNR across 0–3.3V ADC range. |
Use Scenario: Conditioning analog output of electrochemical CO sensors (e.g., Alphasense CO-BF) with temperature compensation and anti-alias filtering. IC Role / Device Role / Timing Role: OPA4347UA Ch A performs TIA conversion, Ch B implements 2nd-order low-pass, Ch C buffers RTD reference, Ch D drives ADC sample-and-hold. Use Value: 350kHz GBW supports 10Hz–100Hz gas response bandwidth; 2mV VOS ensures <1ppm CO measurement error at 100ppm full scale. |
| 2-Wire Loop-Powered Transmitter | Battery-Powered Portable Monitor |
|
Use Scenario: Signal conditioning and current loop drive in 4–20mA industrial transmitters powered from loop voltage (12–42V). IC Role / Device Role / Timing Role: OPA4347UA Ch A–C condition sensor inputs; Ch D serves as precision current source control amplifier in XTR115-compatible topology. Use Value: 2.3V min operating voltage allows use of internal LDO-regulated 3.3V rail; rail-to-rail output maximizes DAC headroom for 16-bit current control resolution. |
Use Scenario: Multi-sensor data acquisition in handheld air quality meters (PM2.5, VOC, CO, temperature) powered by rechargeable LiPo. IC Role / Device Role / Timing Role: Each OPA4347UA channel conditions one sensor type; all four share single 3.3V rail and enable synchronized sampling via MCU GPIO. Use Value: SO-14 package fits 12mm × 12mm PCB area; 34µA max IQ per channel keeps total analog subsystem draw below 150µA during sleep mode. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMV334IDR | Higher IQ (60µA/channel), lower GBW (1MHz), same SO-14 package | Not suitable for multi-year battery life; better for higher-speed sensor interfaces requiring >500kHz bandwidth | Select LMV334IDR only when speed outweighs power constraints and operating temperature range is limited to –40°C to +125°C. |
| TSV914IYDT | Lower VOS (1.5mV typ), higher IQ (85µA/channel), wider supply (2.5V–36V), TSSOP-14 | Supports industrial 24V systems but consumes >4× more current; not qualified for –55°C operation | Choose TSV914IYDT for wide-supply industrial transmitters where precision offsets matter more than battery runtime or extreme temperature compliance. |
Compared with OPA4347UA, LMV334IDR trades 3× higher quiescent current for 3× greater bandwidth, while TSV914IYDT offers tighter offset but sacrifices –55°C capability and doubles power consumption - making OPA4347UA uniquely suited for long-life, wide-temperature, low-voltage safety-critical sensing.
Availability
OPA4347UA is available at Aetrix Electronics and suitable for smoke detection systems, CO monitoring equipment, and 2-wire industrial transmitters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for OPA4347UA includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of heritage in precision op amps and industrial-grade signal conditioning ICs.
The OPA347 family - including OPA4347UA - was designed specifically for ultra-low-power, rail-to-rail sensing in battery-operated safety and environmental monitoring devices, emphasizing longevity, reliability, and wide-temperature operation.
FAQ
What is the maximum operating temperature specification for OPA4347UA?
The OPA4347UA is fully specified and tested from –55°C to +125°C, with absolute maximum ratings extending to +150°C junction temperature. This makes OPA4347UA suitable for under-hood automotive cabin sensors and industrial fire alarm panels exposed to extreme ambient conditions.
Does OPA4347UA support true rail-to-rail input and output operation?
Yes, OPA4347UA supports rail-to-rail input (V– – 0.2V to V+ + 0.2V) and output (within 5mV of rails into 100kΩ). Its complementary input stage enables operation beyond supply rails, and its class AB output stage maintains high open-loop gain even near saturation - critical for low-voltage sensor interfaces.
Can OPA4347UA drive capacitive loads commonly found in ADC input circuits?
Yes, OPA4347UA can directly drive up to 250pF capacitive load in unity-gain configuration. For larger loads (e.g., SAR ADC inputs with >500pF), adding a 10Ω–20Ω series resistor at the output improves stability without degrading DC accuracy - a technique validated in TI's SBOS167D datasheet Figure 6.
What is the typical quiescent current per channel for OPA4347UA at 2.5V supply?
At 2.5V supply and 25°C, OPA4347UA draws 20µA per channel typical, with a maximum of 34µA over temperature. This ultra-low IQ enables multi-year operation in battery-powered smoke detectors using CR2032 or AA cells - confirmed in Electrical Characteristics Table, row "Quiescent Current (per amplifier)".
Is OPA4347UA pin-compatible with other quad op amps in SO-14 package?
No, OPA4347UA has a unique pinout optimized for quad independent operation (e.g., pins 1/7/9/14 are outputs; pins 2/3/5/6/10/11/12/13 are inputs). It is not pin-compatible with generic quad op amps like LM324 or TL074 - users must follow the exact pin mapping shown in Figure "OPA4347 TSSOP-14, SO-14" on page 2 of SBOS167D.
OPA4347UA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- microPOWER™
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 4
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 0.17V/µs
- Gain Bandwidth Product:
- 350 kHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 0.5 pA
- Voltage - Input Offset:
- 2 mV
- Current - Supply:
- 20µA (x4 Channels)
- Current - Output / Channel:
- 17 mA
- Voltage - Supply Span (Min):
- 2.3 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
OPA4347UA FAQ
1.How can I place an order for OPA4347UA through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA4347UA on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for OPA4347UA reliable?
The price and inventory of OPA4347UA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA4347UA is usually 5 days.
3.What payment methods are accepted for OPA4347UA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA4347UA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA4347UA?
OPA4347UA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA4347UA order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for OPA4347UA?
For technical support, including OPA4347UA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA4347UA requirements.
6.How does Aetrix verify that OPA4347UA is sourced from the original manufacturer or authorized distributors?
All OPA4347UA products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that OPA4347UA meets industry standards.
7.What is the process for return or replacement of OPA4347UA?
All OPA4347UA units undergo pre-shipment inspection (PSI). If there is an issue with OPA4347UA, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The OPA4347UA part is unused and in its original packaging.
Return procedure for OPA4347UA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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